Meter-relay.



H. s. BAKER.

METER RELAY. APPL-IOATION FILED APR.4, 190s.

. 926,31 2. Patented June 29, 190%.

. INVENTOR serves toaccentuatethe mid-position of the contact arm and the two extreme positions arm upon Wh'lChthree magnetizable blocks 25 and 26 are located. The end of the pointed or magnet 23-maypreferably be beveled so that its flux may be concentrated.

upon one of the magnetizable blocks and these blocks are so arranged that the attraction between the blocks and the magnet of its motion in which itengages the movable "contact members. The strength of the f st magnet 23 and the size and arrangement of the blocks 24:, '25 and 726 are such that any tendency for the arm' to chatter in'the' vicinity of the stationary contact members 'is' obviated, whilethe .force o t-- attraction between the magnet and! any one of the blocks 1s not suffic ent to perm t any considerable varlation from the constant value of current which is maintained in the circuit 9-10.

Figs. .3 and fl illustrate a' modifiedarrangement of arts in which a magnet .27 is attached to the end'ot- .the movable con tact arm and "replaces-the niagnetizable blocksv 24,25yand 26. The magnetQT may be either. a straight bar or in the form of a horseshoe and will be arrangedto be attracted bywthe stationary magnet 23 and its ends may also preferably be pointed so that the held of influence between the two magnets is narrow. VVith this arrangement the mild-position of the movable arm only is accentuated but if the'arm is held in this position untilthe turning forces are suificient to overcome'the magnetic attraction, chatbetween; said stationary contact members, of"

a statn n ary magnet 'so located as to cooperate with said magnetizable blocks and thereby accentuate the positions which the movable member is adapted to occupy. f

25111 a meter relay, the combination with a pair of tationary contact members, and a movable contact 'member having three mag net1zable pieces, the open circuit pos'itionof said magnet being between said stationary magnet and in the contact members, of a returning spring which normally holds the movable member in its open circuit osition,;and'magnet1c means cooperating wit accentuate the open circuit and closed. circuit positions "of the movable member.

3: In a meterf'relay,-the combination with a movable contact arm," a pair; of similar stationary contact members, o t a statlonary a plurality"of 'magnehzable projections on'saidmovable arm which are positionsto which it is adapted Ina meter relay,'the comb nation with a pair of-statio'nary contact membersand a pmovable contact member th' e' open" circuit position of which i's'between said stationary contact members, anda "spring tending to hold the movable member in open. circuit position, of a stationary magnet serving to accentuate -the'"open' circuit and closed ..circ'uit positions of ,saidlmovable member.

' The combination with 'n inovablearm,

and meansufor' returning it .to a middle position when moved therefrom 1n either direction external fo'rces, ofpmeans for ac centuating' three positions compris ng devices attached tot he, arm, and a stationary magnet which produces a concentrated field to act upon said devices in said positions.

6. The combinationwith- 'a movable cons tact-carrying arm, a pa1 r of statlonat'ycontact members which may be engagedbythe I contact-carrying arm and areturn'in i spring which normallyfholds the arm'in a position "midway between thetwo stationaryi termif nals,=of a relatively movable magnet and magnetizable blocks therefor which" parts are cooperatively located onthe' movable contact arm and ,on a relatively stationary body.

'7; The oombination with a' movab le contact-carrying arm, a palr. of stationary contact members which maybe engaged by the contact-carrying arm and a returning spring which normally holds the arm in a position midway between the two stationary terminals, of magnetic means for accentuating the 1 mid-positions and the two positions of contact witlrthe stationary inembers. v

In testimony whereof, I have-hereunto 4 subscribedmy name this-31st day of March,

' HENRY S. BAKER.

Witnesses WESLEY G; CA R,

'BIRNEY Hnvns.

the magnetizable piecestofield produced by the magnet'when the movable arm occupies any one ofthe 

